lewis



(No Model.) 2 Sheets-Sheet 1.

G. W.LBW1S. STEAM ENGINE.

No. 408,490. Patented Aug. 6, 1889.

(No Model.) 2 sheets-sheet 2. G. W. LEWIS.

STEAM ENGINE.

No. 408,490. Patented Aug.r6, 1889.

lNITED STATES ATENT OFFICE.

GEORGE W. LEVIS, OF LA SALLE, ILLINOIS, ASSIGNOR OF ONE-HALF TO CHARLESBRUNNER, OF SAME PLACE.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 408,490, dated August6, 1889. Application filed February 26, 1889. Serial No. 301,200. (Nomodel.)

To all whom it may concern:

Be it known that- I, GEORGE WV. LEWIS, of La Salle, in the county of LaSalle and State of Illinois, have invented certain new and usefulImprovements in Steam-Engines; and I do hereby declare Athat thefollowing is a full, clear, and exact description thereof, referencebeing hadto the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification. v

This invention relates to a novel construction in the valve mechanism ofoscillating engines, and has for a primary obj ect to provide anautomatic cut-oft in such engines. y

Another object of the invention is to provide for an automatic reversalof the engine, and still another object .is to provide a construction bywhich either a full or a partial rotation of the driven shaft may beobtained.

The nature of the invention will be understood from the followingdescription of the accompanying drawings, in which- Figure l is a planview of the engine, with the top of the chest taken away, in the line ll of Fig. 2. Fig. 2 is a central vertical section of thecylinder,valvecliest, and Subj acent part of the frame and a side Viewof the remaining parts, the sectional line being indicated by the line 22 of Fig. 3. Fig. 3 is a transverse vertical section of the cylinder andvalve-chest in the line 3 3 of Fig. 2. Fig. 4 is/ a plan view of theengine in part of the section, taken on the line 4 4 of Fig. 2. Fig. 5is a vertical section in the line 5 5 of Fig. 2. Fig. 6 is a side viewof the valve and its immediate connections, shown resting upon thevalve-seat indicated in central vertical section. Fig. 7 is a top viewof the valve. Fig. 8 is a bottom view of the valve. Fig'. 9 is avertical section in the line 9 9 of Fig. 4.

A represents the cylinder, having central opposite hollow trunnions ora, mounted in suitable bearings in the frame B, as well shown in Fig. 3.Steam is admitted through one of the trunnions and discharged throughthe other, as indicated by the arrows in Fig. 3, a and a2 being,respectively, the supply and exhaust ports leading from thetrunnion-pipes to opposite sides of the valve-Seat, and a3 d4 being thecylinder-ports.

O is a shaft mounted rotatably in the frame B, and having thereon acrank or disk, the wrist-pin of which is shown at C.

D is the piston, and D the rod connecting the piston with the wrist-pin.

E is the valve-seat arranged on the top of the oscillating cylinder A,and E is the valvechest covering the seat.

F is a slide-valve operated by the rod F, which projects through asuitable stuffingboX e on the valve-chest and extends parallel with thepiston-rod, say, as far as the outer extremity of the stroke of saidpiston-rod. From the piston-rod, at or near its outer end, rises an armG, through the upper end of which the valve-rod F slides and by which itis guided, as illustrated in Fig. 5.

I-I is a rod vor bar connected by arms h with the valve-rod F', andarranged at one side of, in substantially the same horizontal plane, andparallel with the main Valve-rod F. The valve-rod F is provided withadjustable stops or tappets f f, between which the guidingstandard Gworks, and which it strikes to throw the valve.

On the same side of the standard G as the parallel rod His pivoted on ahorizontal pin 'L' a pendulum-rod I, provided with a ball or weight z"at its lower end,which will swing in the direction of the piston-rod.The pendulum-rod I extends above the rod H, and at its upper end isprovided with a cross-bar I, from the ends of which project over the rodII two arms i2 2 at equal distances from the central vertical line ofthe pendulum-pivot. The valve-rod F is rotatably connected with theValve F, and reciprocates the valve by engagement of two pins f f2,arranged on opposite sides of the raised cross-rib F2 on the top of thevalve. In the reciprocation of the piston, therefore, the pendulum willbe vibrated with the effect of causing the arms i2 of the cross-bar I tobear downwardly successively on the parallel rod H and to therebypartially rotate the valve-rod F. A spring G', attached at g to thestandard G and arranged to bear against the lower surface of theparallel rod H, will operate to lift said parallel rod, and thereby torotate the valverod F back again whenever pressure on its upper surfacefrom the pendulum is removed.

IOS)

- is morefreadily accessibleforadju-stment. f f s In the reciprocationof the piston, therefore, the valve-rod F will be oscillated in itssupports to an extent due to the range of vibration of the pendulum I.This oscillation of the valve-rodis utilized as a means for controllingthe proposed cut-off for the steanr supply, and for this purpose thevalve F is provided with an auxiliary valve F3. The main valveF is cutaway on that side at which the parallel rod H is placed, as indicated atf3 in Figs. l, 3, 6, and 7. The steam-inlet port a', delivering into thesteam-chest at a central point at the same side as this recess f3, is bysaid recess left constantly open. From the recess f 3 a horizontalpassage fJA is formed in the main valve F, connecting with a verticalcontinuation thereof, (shown at f5 in Figs. 2, 6, and 7.) At a pointabove this steam-supply port f4 of the valve, and to the end of thecross-rib F2, is pivoted the auxiliary valve, consisting, as shown, of aplate F3, the lower end of which bears against the vertical face of therecess f3 and may slide back and forth over the port f4. The pin f',which is shown as passing through the valverod F', is arranged to engagethis pivoted valve-plate F3, so that on the depression of the parallelrod H and consequent partial rotation of the valve-rod F the valve-plateF3 is vibrated into position to more or less cover the steam-valve portf4.

F5 is a spring suitably arranged to retract the valve-plate F3, so as touncover the port f1 as the pin f rises in the back rotation of thevalve-rod. This auxiliary valve is shown enlarged in Figs. 6 and 7. Thisspring may do the work of the spring G; but the latter An arm G2,secured to the standard Gand extending .outwardf beneath the parallelirod f IH 'at `a suitable'distancei belowr thevalve-rod F",'serv`es toform a' limit to the rotation of f the valve-rodbeyondi an `extent*necessary to allow the 'valvep'late F3 to entirely close fthe isteam-portf4.y

i i -i From the construction describedit isy mani-` z festthat thehigher thefspeed of the engine the greater theretardation of thependulum i" byy its inertia in theiirst parti of` the stroke either way,and' the'quieker rwill it therefore eifect the partial rotation of thevalve-rod and the cutting 'o of steam. f t f f f By shifting thepositionrof the the valve-rod F the valve F may be shifted before the rerankhasinade a full half-revolni; tion, andy in thatcase the shaft C'Willbeyos-i f Ieillated instead sof rotated'by :the engine.

- 'Thevalve' F being made symmetrical, theenway, and in order that itmay automatically change the direction of rotation of the shaft C, Ihave provided devices illustrated in Figs. 4 and 9. Of these J is ashaft, on which is mounted a disk or arm J having a projection j.

,7" j2 are gear-wheels, by which the shaft J is rotated from the shaftC.

K is a spring-arm attached to the frame B or other firm support andarranged to project in the path of the projection j, so as to strike thelatter when the engine is on a dead-center. The arm K, made of properstrength, will arrest the disk J', and through it the crank C', and itwill also at the same time start all these parts in the oppositedirection by reason of its resiliency. The engine will thus be reversedin its motion, and it will continue to run in the reversed directionuntil the projection j is brought into contact with the opposite side ofthe spring-arm K, when it will again be reversed. By means of thechange-gear j jg, or suitable substitutes therefor, any desired numberof revolutions may be given to the engine in either direction or betweenthe points of reversal, and, inanifestly, if the wheels j j? be of equalsize, or, what is the same thing, if the disk J be attached directly tothe shaft C,the engine will make but one revolution in each directionbcfore reversal.

In order to enable the reversing devices to be disused at pleasure, thespring-arm K is illustrated as being mounted movably on a stud k and ashaving an arm 7c', which may be at pleasure engaged with or disengagedfrom the pivoted latch k2.

The spring G', which opposes the rotation of the valve-stein F', may beadjustable as to its tension, and thus made to vary the action of thecut-off as effected by the pendulum I. As shown in the drawings, said'spring G is a coiled Wire or rod having an eye which surrounds the studg and a short arm g', the end of which, to give adj ustability, entersone :of a series: .of kholes f (shown at g2.)` locatedk in ythe are ofafcirele drawnfrom the center of y 'theistud q.k The pendulum-ball' tfmay of course be made adjustable enL the penduln nif yrodwiththe sameeffect.-x ,c i I `do not wish to be restricted to .y the preleiseconstruction herein illustrated,inasmuch as itk may be varied iny manyparticulars with u i. outdeparture from my invention. t f I claim asmyinventionf i i i f f f f l. The combination,y withy theypiston-cylinderzand a. steam ycut-olf valve operated `by os- IOOcillatien yof the valve-rod, `,of apendulum car-k ried kby therpiston-rod yand' engaged with the f f valve-rod, whereby the latterisoscillated rby stops f on f the inertia of the pendulum. c f

'2. The combination, with thepistonfcylim f deraand:yitssslidefvalve;provided Witllal mlf f f iliary steam cut-off valve, .ofany oscillating i c c .f i valve-rod operating the auxiliary valve byits j .f

' oscillating movement, a pendulum carried .by i gine is capable ofkrunning equally well either rod to partially rotate the latter by itsinertia, and a spring arranged to rotate the valve-rod in an oppositedirection.

3. The combination, with the piston-cylin der having a valve-seatprovided with ports d', a2, and a3 and with a steam-inlet into thevalve-chest, a slide-valve provided with a central steam-port andexhaust-ways, and an auxiiojk, I

y y n y the ypiston-rod andk engaged with fthe valvcf i .E

iliary valve for said steam-port of the main valve, of a prolongedoscillatory valve-rod provided with tappets and having actuatingengagement With the auxiliary valve in its oscillating movem ent, aparallel rod H on the valve-rod,a standard G, carried by the piston-rod,a pendulum pivoted on the standard, the rod of which is provided Withlateral arms i2, arranged to bear on the rod H, and a spring arranged tooppose the pressure of said pendulum-arms, substantially as described.

4. The combination, With the oscillating piston-cylinder provided with aslide-valve on the side thereof between the trunnions, of a prolongedvalve-rod provided with tappets and a standard or arm on the pistonarranged to strike the tappets for the reversal of the valve andconstructed to guide the prolonged valve-rod, substantially asdescribed.

5. The combination of the oscillating piston-cylinder provided with avalve-chest and with a valve and ports adapted to the running of theengine in either direction, acrankshaft connected with the piston-rod, aprolonged valve-rod having adjustable tappets, and a standard on thepiston-rod arranged to' stantially as described.

6. The combination of the piston-cylinder provided with a valve-chestand with a valve and ports adapted to the running of the engine ineither direction7 a crank-shaft connected with the piston-rod, an arm ordisk having an arm or projection driven by the crank-shaft, and aspring-stop arranged to strike and arrest the arm or projection when thecrank-shaft is on or near a dead-center.

7. In combination, the piston-cylinder, its Valve, the valve-actuatingmechanism, the crank-shaft, the disk actuated by the crankshaft andhaving a projection, and the springstop arm for engaging the projectionon the disk, and mechanism for detachably locking the spring-arm,substantially as described.

ln testimony that l claim the foregoing as my invention l affix mysignature in presence of two witnesses.

GEORGE W. LEWIS. Vitnesses:

F. E. HOBERG, H. W. UNDERHILL.

